Improvement in millstone-drivers



M. HOLDEN.

Mill-Stone Drivrs NOV.148,06\ Patented M a rch 3.1874.

Witnesses: In enmr: A Wag 77. p /M Q/Q Per Anumeys.

UNITED STATES PATENT Orrron.

MOOR HOLDEN, OF CINCINNATI, OHIO.

IMPROVEMENT IN MlLLSTONE-DRIVERS.

Specification forming part of Letters Patent No. 148,061, dated March 3,1874; application filed June 21, 1873.

To all whom it may concern Be it known that I, Moon HOLDEN, ofOincinnati, Hamilton county and State of Ohio, have invented a new anduseful Millstone- Driving Eye, of which the following is aspecification:

My invention relates to an improved form of those combined sockets andbushings in one piece or casting which are embedded permanently in theeye of the runner, and which operate to balance and drive the same,while at the same time serving as an inlet for the grain; and myimprovements are designed to combine in the most perfect manner theadvantages of easy and certain feed with a firm yet delicate poise ofthe runner, whereby the latter is enabled to readily accommodate itselfto the face of the bed-stone without binding or raking, and,consequently, without loss of power or the liability to overgrind,scorch, or kill the flour.

In the accompanying drawing, Figure 1 is an axial section of my improveddriving-eye in position upon the spindle, whose upper portion only isshown. Fig. 2 is an under-side view of the same, the spindle being shownin transverse section.

My bushing A is in the form of a hollow conical frustum, which flaresdownward, in the manner shown, and from the exterior of .whose lowermargin there project lugs a. a,

whichare embedded in the substance of the runner, whose eye the saidbushing lines. Suspended centrally within the bushing A, by

, means of arms B B ,'is my socket 0, whose eX- terior portion is aconic frustum concentric with the bushing, and whose interior is squareand tapers upwardly to receive the correspond ingly square and taperinghead I) of the spindle, which latter is made suiiiciently smaller thansaid socket to permit the necessary play or automatic tram of the runnerwhen in oporation. The arms B B are chamfered on their under side, andare located near the top of the eye. A steel cock, E, at the summit ofthe berof advantages, which, as a whole, are believed to constitute avaluable novelty.

The flare of the bushing enables its peripheral surface to share withthe lugs a a the support of the runner, and its smooth interior surfaceand downwardly-increasing area are further useful, by assisting thedescent of the grain, which, in vthe old-fashioned cylindrical eye, isliable to wreathef and choke in consequence of the accumulating vorticalaction generated by the rapid rotation of the runner. The chamferedunder surfaces of the arms B B assist in beating down the grain inwhichever direction the runner may be rotated, and their location nearthe top of the eye causes them to offer the least practical obstacle tothe descent of the grain, which at this point descends more freely anddirectly than it does lower down in the eye after it has been subjectedto a longer continuance of vorticalaction.

The driving-surfaces D, being four in numher, and as near as practicableto the axis of revolution, offer the least possible resistance to thetram of the runner, and enable it to easily assume and maintain exactparallelism with the bed-face; in other words, the runner is driven withequal stress and equal resistance all around its plane of rotation, andhas no tendency to bind in one vertical plane, as is apt to be the casewhen impelled by two opposite drivers, which enter and play within thebody of the runner beyond the circumference of the eye.

Disclaiming novelty in a square and tapering spindle-socket unit-edrigidly to a downfiaring bushing embedded in the runner,

I claim as new and of my invention- The driving-eye consisting ofbushing A a a, arms 13 B, chamfered below, located near the entrance ofthe eye, and affording rigid connection of the eye with the upper partonly of the socket G, having a taperingsquare cavity for a spindle ofcorresponding form, substantially as set forth.

Witnesses: MOOE HOLDEN.

W. L. ALDRICH, THEO. G. MORY.

